EA5HVK

Complete article about ROS in Practical Wireless Magazine, by Mike Richards G3WNC.

More info in: http://www.pwpublishing.ltd.uk/

ROS DXCC Awards for 25-50-75-100 are available for the E.R.C. Members.

Send your ADIF file (*.adi) to EA5HJY to verify the QSOs. More info on http://www.europeanrosclub.tk/

The actual record is for the E.R.C. #0001, Arkady Grikurov RN6AM. He has got 91 DXCC in the first year of ROS Mode. I am sure he will achieve the 100 DXCC ROS Award.

.adi file:

Awards design by EA5GKO. Many thanks.

With this tool you can get the Coverage Area Map for each Band.

For a better use of VOACAP, ROS sends the EIRP for each Band according the features of your station. So, the power that appears in the Map is the EIRP, and the antenna will appear in the map as “isotropic”. 

You must enter the Antenna Gain and others parameters to get the EIRP easily.

Note: If you have an ATU close to antenna (on the roof) , set SWR as 1.0. If the ATU is in the Radio Shack, then enter the SWR measure in the antenna. Also, for the Antenna Gain, consider that it decreases if there are objects near the antenna.

Example: Coverage Map for EA5HVK on 20 meters (Short path)

This service would not have been possible without the support of Jari Perkiömäk OH6BG.  Thank you!

Click on SHORT/LONG buttons to get the VOACAP Point to Point Prediction for Short path or Long path, respectively. (Short path)

Example: EA5HVK–>CO2DC Prediction with 50Watts and Isotropic antennas for ROS Mode.

This service would not have been possible without the support of Jari Perkiömäk OH6BG.  Thank you!

Some interfaces have external or built-in potentiometers for the audio input adjustment to the soundcard. Unfortunately, this potentiometer is adjusted in some interfaces for a minimum volume output and it is not appropiate for weak signals detection. Test have shown that you could loss until 10 dB of reception if this potentiometer is not properly adjusted.

Recommended to adjust this potentiometer for the maximum audio. After, adjust the audio input properly using the Windows Audio Mixer until the ROS VU marks about -5 dB or -4 dB.

Now, with the v6.4.1 Beta, ROS CAT can works until the Virtual Port Number 40.

Great DX of 4300 kms last weekend on 6 meters of TR8CA in Gabon with Spain and Italy. Congratulations!.

This new system adjusts the RF Power depending on Fade Marge you want to have and using the reports recieved. Thus, communications can be more efficient.

In the APC menu, select the Fade Marge and the Power Limit for this system. +10 dB is an enough value for Fade Marge, but you can experiment with lower values. 

APC is switched with the APC switch.

Important: Logically, this system requires a CAT interface and a rig with the possibility of controlling the RF power by commands, unless you have a robotic arm connected to the serial port.

Long  range  requires a low gear ,

Following the  excellent  decode  of G0NBD by  RN6AM , at  a  range  of  some 2000  miles  with  part of the  path  in daylight , a night  time test  with  CO2DC  proved the  viability  of the ROS  data  mode’s  immunity to  path distortion , by  providing  decodes  over a  4400  mile  path in darkness , from 100 watts  to  a  35  ft  end  fed ground mounted vertical  Ae , reception  by 40  mtr  dipole

To date  the  5  meg band  has been  the  grave  yard  of  data  modes  , turbulent  and  unstable  propagation reducing end  stopping  signals  to  gibberish  , high  band noise adding  destructively to  the  drop  out rates  of psk  systems.

Full  decodes  where  obtained by  CO2DC at  all  speeds , with an impressive  100% decode  over a  5  minute period obtained  using the  low  range  HF-4 mode , designed to  provide  full  256 character  communications  in ”below noise”  ‘last  ditch’  situations

RX16: 01:01 @ 0,0 Hz: CQ de  G0NBD  in IO83lk  <STOP> -21 dB 
RX8: 01:06 @ 0,0 Hz: CQ de  G0NBD  in IO83lk  <STOP> -20 dB
RX4: 01:10 @ 2,0 Hz: CQ de G0NBD  <STOP> -21 dB
RX4: 01:11 @ 2,0 Hz: CQ de G0NBD  <STOP> -17 dB
RX4: 01:12 @ 2,0 Hz: CQ de G0NBD  <STOP> -20 dB
RX4: 01:13 @ 2,0 Hz: CQ de G0NBD  <STOP> -22 dB
RX4: 01:13 @ 2,0 Hz: CQ de G0NBD  <STOP> -19 dB
RX4: 01:14 @ 2,0 Hz: CQ de G0NBD  <STOP> -22 dB
RX4: 01:15 @ 2,0 Hz: CQ de G0NBD  IO83lk g0nbd@hotmail.com  <STOP> -21 dB
RX8: 01:16 @ 0,0 Hz: d i de G0NBD  I o83~0nbd@hotmail.com  <STOP> -20 dB
RX16: 01:16 @ 0,0 Hz: CQ de G0NBD  iðtt¦lk g0d@hotmail.n e <STOP> -21 dB
RX4: 01:17 @ 2,0 Hz: , 73. de G0NBD sk  <STOP> -19 dB

30WP210 ACTIVE beacon on 27.505, locator JN11ck. Email reports are welcome